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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cab8b60c177e619190f84495fe75be025870a4ee2a8ee688700d373318e7af' 
  AND token = 'Wwti/cMSADi1CDSHoTJDExNDv0JIY0T9COMQXhiTKbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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