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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18804aa1db8636a2797516627976909279a833828c615009b728d68efb2650db' 
  AND token = 'Wi4vOpbK69ibDg6JSi+/t2ifjNhIs6Bx4/dzhJpcK2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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