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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861bd8955d1ea10300ff6b5bf462813b77687bb006f537a4f3884b851623a934' 
  AND token = 'Pitu80I1Fae82fhVUD3t8jCvIEX8jPpZmLmu8wE+F9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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