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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0058d7d9ab968d84b830500fbcde76700ddb5722f30677e31b388ff29aa59305' 
  AND token = 'aYUIevAgWGe7NdfGsZoeW0EOmh/RjI6+hiye1hZaUZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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