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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5960933f5d3912ea0cd00502312154bd7bf2a7caba183d5e100b8048ddd9019c' 
  AND token = '9iHZF92EtKPRx3tOE1dJ9L8G0jRUaG+78CAkWg3Sz5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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