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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc33866d8780072d5a0bfce383532f37d4edd14efa51c926c9dbbf1f702d9d0' 
  AND token = 'Qxzu08DcYckMgnnszw8tSEsTY3Y2xmhs9ajvmaTew8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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