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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d885d83fff5f311a454e8d9d62fb0863925a0f61da7649b36fb8ead080d040b' 
  AND token = 'G5Ocz5ukmWGGqPCiGy9RRE6lUiL/ROYfeNeHELGnKEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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