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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96604f8c7389fe4b80febcdf61d56913fb0bd0712c7de714d1a2f7221b639705' 
  AND token = 'FNvQb3fcGkkrdE2iQL9UnlsoEpoSHSPyAzs0vlFiNC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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