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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239d0412903e9b7d71aaec83082ce04018b8378b63e77913d48270c07ba178d1' 
  AND token = 'moGtOhrxAhWYl8tYTSqiCw4f++02SPFk4ZkvdoZuxVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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