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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b372c8779a0ded8fbd7dae8f2efd46db6ffe94b618aa38056217dae04362d18' 
  AND token = 'ZdlBXIsJK9TsYq3YQL3b+tzeP8xELH4AqqNp7KrRqes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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