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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59167d69551b69a1d1e58ed66e20f5fb9905bf9277d9a53dac947eb16ec53c8' 
  AND token = 'VIQgK6droGTXP8dXaQNem1eeukGqsb/yI71EFIGxePc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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