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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869b2955facf3fdbd5e6b025a7f710c3ea3cc7fb27e1f634155c2b0ceed9c197' 
  AND token = 'RfCUGYqpVr1oeunhHRj3z9wo9BMbtGiEnaBkNRUz5C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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