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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e094b6372456747c8c9a6addceba17127c110f5094ce770739787f1a0b31fc7c' 
  AND token = 'YF1Qknn5xeh9lQX/VS6uwOiEGun4hSPaK/giZd3MReg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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