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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3fa94467d4832873177aa2b210ce094597ceccf4585b17353f06d13fc23ec5' 
  AND token = '6jCJm9ZTW0xCudcBMZhuZXy9RHjWhMtX+tqbvhQtafs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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