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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92182ac714656b32476edc15b5f8f7f96acff2da7f403ed4b442c19d199e0e1d' 
  AND token = '1rxDh6+HmdDpBeEL0hcSDh9w5WLja/+Z5imZQvmAjDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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