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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efe7c5d7e93f0bf38f48df9bc87c324c3288ba2a7334753a4c9a81e44369f3b' 
  AND token = 'RCka/x+tvBuW53Y8BeJfKtK3dKwbORziJEp7kn2gGqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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