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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfc1b040c64552d75fee4b4ce89bb8df492c5a803ce6df85f7fb92044e748df' 
  AND token = 'U6Kh4fYSctY3K8X3iwQ/gly2em0P6vKXk4/iGlEcQSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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