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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29584a5bae9aa47f739e6aeb69f38ac70c7e3e433bed3804368805c5fcda6ee' 
  AND token = 'ex2WFjIbLngSFUr624RUKiMR3+0alipZWce4Xr2NNx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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