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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755a0f7a65e35c1aafbc4b9d8ebf78dbf1aa4f914d367513746e5a445b99d41b' 
  AND token = 'VRONCk1WG+J/mviODHLR8KySxOL/LBjAzNiubp7AEaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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