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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9131bf3afab8b96755762c8255d700bf09399aec226c8e4fda4c7a877d362b4a' 
  AND token = 'kWIIyoUiDBiCyh8JKp2SBe6pWdtE8Epp1QX3ePBuKXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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