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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bfe750fe05f05f90410f75619affacd17b272657d70def8c74e0acc67fdd8e' 
  AND token = 'CHYB9WfPOCpxkQydY219Vog1iW7hFe0wflOMf3T9PAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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