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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06efec62573049e0c98c96013883a983e030976cf9bf26ccf1712d49ac4cbb65' 
  AND token = 'Bf9P3JSIt67OJsJcVsscYMTB19T4c5LEg++CdtTqF+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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