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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1048b07b78ac6b07c5445324c1b7d023c068366f6416cfa1fc7fd9ac73ef083b' 
  AND token = 'Z8jGc4eXclFdGg4EIb+CeNFnGUBsHQ8Pu4iYM7/tBCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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