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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48f32700ca9377167a4c00a4275a2911ae78b1ace2fc05bed85b3f0289b96c3' 
  AND token = 'vpSWrhr/Ijf9651DJnobUb7IdL90o7YPYogrmYGScf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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