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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a7ec2e8ed3f87eb18af357cdf07d9c8c794e2c63ec83fbd4015ebc1ff9a387' 
  AND token = 'xC3zsgq5X2ux32yvIcpJZQ3w4RQS5wXL6J5Ifc6NfR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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