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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a33944b26ba2b79c50f6afb6ba6e5084941e8ab3ec9afa5685b8f86c38dd7a8' 
  AND token = 'OJVo50RGBP84NLPnAbLWZfoFfFOTJczbE0qx5pRmhQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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