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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8bcfb2cd1e1a2c3f2e652527e9d6544d43182aa5623abb09e155121289a9bd' 
  AND token = 'UqNRCN2L/N7siS+pZyGFGYfE5+IAvSH7JxahC4oQGyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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