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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae5764aa1588a26ba59d017338e9d1d2e495fb79903ea1b350a20ecd10466c2' 
  AND token = 'v/05A692nX5WxK4kQ6qjNHV2EuJ2bZduiGRBlELLljQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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