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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264f2cc19fa0f516408f7be813f23a64f5dd787e505e5cfca10ab1e0bd99ffa8' 
  AND token = '0UgKQWIwNMqlZ+4eh7MgNQwF5xCqFPnLEfkeVLtRm/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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