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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd69c0dd94a4b556ab284304c6e05ceaa3f2005cfde06c97a70a8df12596fed3' 
  AND token = '1risNGzsbbfJMS7J365FcvpvMwXI4nF+O7fIQdHcA3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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