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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb42d92dbc6f1b4a3234470e1f00c903fe791eb6e568274a27d91f5d8c9a31cc' 
  AND token = 'fkH5mutXx9AHbw7UYARlo/5YCSrnAgXziztjbfJfOek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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