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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c54962232763ca7fd73ad8841fc4175c77ad9440dfac1bd1f6e756b0074783' 
  AND token = 'pXa6HCWnXQDtO74Vn77X4Dhw5ATNsMNrszk64DURtLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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