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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357c28a03a14e1e0996f1f7706b3d0dd21d5f2ad45b065ece0ed3ac6fe93106a' 
  AND token = '7DmsgLSdpKlC7fO7zW8iV/6Xa5j0q/rWT8vSTZYgNoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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