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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fcac160e81d53068cdc61a89b5686b588423a38fcbaf8d169124d7749fced2' 
  AND token = 'AAJtm3NYOEs6XDgqXyfybHc78W8Oqdu/3LSZRAD3VNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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