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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fab0994533c70c3235e5ede5d8fa0bdfcc270b87eb50f6286ad1e5ea56d329' 
  AND token = 'LZjV32CLOxDV4eNvznrlCu+U4R8Nw0a4zybC8Thodc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}