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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc0ddc0419d82ed1299a8949017f5f5d27dd0ce15fd6ec4da7dea00887c8e9e' 
  AND token = 'wSLa+ltM8QG6CPo7Q5+k1tjdPHrCMBjplVtm3j+UDFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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