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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a405a3414fb12b93603d19ffc511e6d624aafa43f48170a2a860ca0ca2486da' 
  AND token = 'YoJQ+TOGU0hxLncL4IS4C3f5+ssh6Kh+/3LLoyl1XHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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