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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf28fcf0c99b4f8c5c6165e23a13484d227cd280d25f9decc2bd4e21bee93e14' 
  AND token = '6iMsG8B9Jl7C3Et4ALDQGQRFKTnaXuuMDDBPYzPS61g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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