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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da180440e058c10f9911142cf00713580921fac20262d8cbfd6b4c201d5c378' 
  AND token = 'SGI0JNSPX8y+xJziQs2nAh9zuJqE3DZ78zHS1c6NjFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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