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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827df349ac5222cd9f37bba9cfe9d5dee416f0e88fae44be38e363b62c3c3ff6' 
  AND token = 'E2nFy0FflHHFD6Mw2+cV509pcnBqzRkdiFk/fNxQY5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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