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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5798de41844db14ec659a2b10714ca1fd5c02936e80a7782e0c9f70eb92c5748' 
  AND token = '2Apd5i6j+//N4RZBCMgZ9ty2g4evOzLDG1i6OJTgaJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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