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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b725669d3ff6de07fc5fac7326ef27b284f7a4bd61b8e27d7cfa3295b7240be9' 
  AND token = '32nRfsjSUVwG0w0RGREeO8TbeZ26752DVoGBHJRVJZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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