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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c013996941bf97cb9761406727a9e8de46c65f8595526f051c957af1c8a837' 
  AND token = 'BRigxHTG9MlnF68Jd2Pah6OLdsXhAJAymCMCaylvLxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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