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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87a6b7e688e7a5e18728db8c531317e33a045a58db4b74f3184e2b4b7abf70b' 
  AND token = 'yg7aVVSb7ZNXPPglLTmeKd6LerI4E9YAC246OG9PlTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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