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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b230500f8a5d91a1ab4ac7dbee9f5e8e1605cc6b3b526428ec556c8bb98cf27c' 
  AND token = 'ILq1rJ2+KAwfr3y5NicpYVd3x8L9G917M177Gb4tAfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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