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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02554ae790e6e36eadbd5cf381023292af6306b282e3455a9cf70d2f6894f1ab' 
  AND token = 'r11M+SMW6tkHO53ivusu3MHT2lt4tYwX/LOkXm8UpGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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