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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16ace5f3a5e404c3ab4bde54d44d23a143517df71a4e0bbb18f6752280d996e' 
  AND token = 'D+heE/7FRHZejkQk7o3JcuSVN29ZeHVIIfE2RhgP8F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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