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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f34ca607f9775f7fb9ed5e01d85d8af4643beb97b999fb285ced5f811d85c' 
  AND token = 'DW4C0Aw04gjcXG91sZcxnNTh26ET2DnNf/K57EY5JnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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