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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc43d33fd0cd1e047f34a362c2998d90cc77bb1c4b9db37eea7c288bfadde9a' 
  AND token = '/gknobzrLiS0pNVYyafBQ/UPC7s/LvDgE3ENcFH9cpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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