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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a360cabfa6e7470cee05060b5b2a54a89fd891f77a80a2d3fbc2188e071126' 
  AND token = 'p0bmXZg4107vomMeSrIItcqj11YgntTGR476AxY+bbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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