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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f93fbdcc4b33234c447b6826355f3a550a7413d29bdee7ad2eddcf86ba51868' 
  AND token = 'iSviz/jtHGoxMzGDi4kn6uqAvSi/oUby7DozJDhpYJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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