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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f1306df74b6c676cc6e7771f4724a4b318babdc62f78362b1a921cf50255bc' 
  AND token = 'uzPWM3oMMA0OuoBmEoJ+31AmKMm2Xerq44hu4rrxyRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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