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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f93cddb61f16ed64aea81c399720a79eb402b6318d598bc03cdcb540d08ec9' 
  AND token = 'd3eliJc4ViroTNj0RjEyPEtfWdS12qbY8++n86xW07U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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