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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c652e6d4406ce80417bf5af2b8bc2c9c07191c2fab900529756c89e8babf46e6' 
  AND token = 'CDg0xqfc5p2RryVBDh/DPfpzV5dyAqQQ/gTK64cNW3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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