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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7deebc5796799131d38484d99d92c32f27149fc30107a82d8eff69b4a2cd674d' 
  AND token = 'EtvxQpo/3XZJpd8fHt0r3UvWvFR0f4jz6hPeRSCHeZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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