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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed40bd29647db91b5ec66e0e7b903679c2a0277ead004a47e8ff197c5cef6c0' 
  AND token = 'GMZ9wyjR4KmTd31GhdUg50qTYgR1jjtsDhaxLJ81D7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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