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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3977caee7e49ed3d6db1f4320315f9d61c7476f9c24a78aef8cbc59a35b34c45' 
  AND token = 'vamlYiUVaIP0Vr948rDDvqVQWfcjgnkErobJeTsQ4NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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