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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9cbac8c528c515fe113bf75240a139c1f4db370e53648ccbd84f329d33349e' 
  AND token = '/RWXjx5ry8Jx9I3pScWZRqptfvrfv4alIucfiaHK7+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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